Great follow-up to the first Ciaphas Cain book...this one finds Cain leading a defense force to protect an energy refinery on Simia Orichalcae (if you can pronounce it, gold star for you). When they arrive, they discover much more than they can safely deal with, and Mitchell cleverly inserts the complex and reluctant Cain into a whirlwind of trouble deep in the ice caves of the planet. There are many humorous and tense moments that compliment each other well as the reader is treated to a narrow escape for the protagonist. The antagonist? Eldars and necrons and orks...oh my.